From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/arch/x86/include/asm/preempt.h | 48 ++++++++++--------------------------------------
1 files changed, 10 insertions(+), 38 deletions(-)
diff --git a/kernel/arch/x86/include/asm/preempt.h b/kernel/arch/x86/include/asm/preempt.h
index afa0e42..a334dd0 100644
--- a/kernel/arch/x86/include/asm/preempt.h
+++ b/kernel/arch/x86/include/asm/preempt.h
@@ -8,6 +8,9 @@
DECLARE_PER_CPU(int, __preempt_count);
+/* We use the MSB mostly because its available */
+#define PREEMPT_NEED_RESCHED 0x80000000
+
/*
* We use the PREEMPT_NEED_RESCHED bit as an inverted NEED_RESCHED such
* that a decrement hitting 0 means we can and should reschedule.
@@ -40,7 +43,7 @@
#define init_task_preempt_count(p) do { } while (0)
#define init_idle_preempt_count(p, cpu) do { \
- per_cpu(__preempt_count, (cpu)) = PREEMPT_ENABLED; \
+ per_cpu(__preempt_count, (cpu)) = PREEMPT_DISABLED; \
} while (0)
/*
@@ -86,24 +89,9 @@
* a decrement which hits zero means we have no preempt_count and should
* reschedule.
*/
-static __always_inline bool ____preempt_count_dec_and_test(void)
-{
- GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), e);
-}
-
static __always_inline bool __preempt_count_dec_and_test(void)
{
- if (____preempt_count_dec_and_test())
- return true;
-#ifdef CONFIG_PREEMPT_LAZY
- if (preempt_count())
- return false;
- if (current_thread_info()->preempt_lazy_count)
- return false;
- return test_thread_flag(TIF_NEED_RESCHED_LAZY);
-#else
- return false;
-#endif
+ return GEN_UNARY_RMWcc("decl", __preempt_count, e, __percpu_arg([var]));
}
/*
@@ -111,34 +99,18 @@
*/
static __always_inline bool should_resched(int preempt_offset)
{
-#ifdef CONFIG_PREEMPT_LAZY
- u32 tmp;
-
- tmp = raw_cpu_read_4(__preempt_count);
- if (tmp == preempt_offset)
- return true;
-
- /* preempt count == 0 ? */
- tmp &= ~PREEMPT_NEED_RESCHED;
- if (tmp != preempt_offset)
- return false;
- if (current_thread_info()->preempt_lazy_count)
- return false;
- return test_thread_flag(TIF_NEED_RESCHED_LAZY);
-#else
return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
-#endif
}
-#ifdef CONFIG_PREEMPT
- extern asmlinkage void ___preempt_schedule(void);
+#ifdef CONFIG_PREEMPTION
+ extern asmlinkage void preempt_schedule_thunk(void);
# define __preempt_schedule() \
- asm volatile ("call ___preempt_schedule" : ASM_CALL_CONSTRAINT)
+ asm volatile ("call preempt_schedule_thunk" : ASM_CALL_CONSTRAINT)
extern asmlinkage void preempt_schedule(void);
- extern asmlinkage void ___preempt_schedule_notrace(void);
+ extern asmlinkage void preempt_schedule_notrace_thunk(void);
# define __preempt_schedule_notrace() \
- asm volatile ("call ___preempt_schedule_notrace" : ASM_CALL_CONSTRAINT)
+ asm volatile ("call preempt_schedule_notrace_thunk" : ASM_CALL_CONSTRAINT)
extern asmlinkage void preempt_schedule_notrace(void);
#endif
--
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